Research Papers

Dynamic Properties of Small Chamber Air Gages

[+] Author and Article Information
Miroslaw Rucki

 Division of Metrology and Measurement Systems, Institute of Mechanical Technology, Poznan University of Technology, Piotrowo 3, 60965 Poznan, Polandmiroslaw.rucki@gmail.com

Czeslaw Janusz Jermak

 Division of Metrology and Measurement Systems, Institute of Mechanical Technology, Poznan University of Technology, Piotrowo 3, 60965 Poznan, Poland

J. Dyn. Sys., Meas., Control 134(1), 011001 (Dec 02, 2011) (6 pages) doi:10.1115/1.4005043 History: Received October 05, 2009; Revised July 18, 2011; Published December 02, 2011; Online December 02, 2011

In the paper, the investigations on the dynamic properties of air gauges are presented. As an important parameter, the time response underwent the analysis. The measurement of the amplitudes of back-pressure pk dependent on the input signal circular frequency ω for the group of air gauges with various parameters has been performed, too. The obtained results underwent comparative analysis with the results of investigation of the step response. The examinations of the step response of typical back-pressure air gage with small measuring chamber and with a piezoresistive pressure transducer led to the conclusion that its behavior is very close to the first-order dynamical system. The examined air gauges could be successfully exploited in the industrial measurement of values changing in time (dynamical measurement).

Copyright © 2012 by American Society of Mechanical Engineers
Topics: Gages , Pressure , Nozzles
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Figure 1

Pneumoelectronic converter: (a) view, (b) place in the measuring system: 1—sensing part, 2—measured hole, 3— pneumoelectronic converter, 4—measuring column, 5—computer, 6—source of the pressured air [13]

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Figure 2

Scheme of the examined back-pressure air gauge

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Figure 3

The experimental setup for step response investigations [16]

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Figure 4

First-order system response on the trapezoidal input signal

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Figure 5

The experimental setup for sine input generation [18]

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Figure 6

The example of the registered sine response

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Figure 7

The example of the obtained amplitude-frequency characteristics

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Figure 8

The example of the air gage step response

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Figure 9

Amplitude—phase characteristics calculated from data of Fig. 8

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Figure 10

Closure response (left) and amplitude—phase characteristics (right)

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Figure 11

Amplitude characteristics of the examined air gage (T = 0.020 s)

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Figure 12

Time constants for measuring nozzles: (a) dp  = 1.800 mm, (b) dp  = 1.400 mm, (c) dp  = 1.200 mm, and (d) dp  = 1.000 mm

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Figure 13

Static characteristics of the air gage with dp  = 1.400 and dw  = 1.200 mm

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Figure 14

Time constants for the parts of characteristics shown in the Fig. 1

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Figure 15

Time constants for different air gages with similar sensitivity



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